In peristalsis following are involved except ?
Correct Answer: Noradrenaline
Description: Ans. is 'c' i.e., Noradrenaline Peristalsis requires an active myenteric (Auerbach's) plexus. Local stretch by chyme releases serotonin, which activates myenteric plexus. Cholinergic neurons of this plexus passing in a retrograde direction release substance P and acetylcholine, causing smooth muscle contraction. Cholinergic neurons passing in an antegrade direction activate neurons that secrete NO, VIP, and ATP, produing relaxation ahead of the stimulus.
Category:
Physiology
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